Simultaneous DTA-TG is an excellent technique for evaluating phases formed in hydrothermally treated CaO-SiO2-H2O and CaO-Al2O3-SiO2-H2O systems. Thermal analysis in combination with XRD and SEM, revealed that in the CaO-Al2O3-SiO2-H2O system the amount of hydrogarnet formed was the largest when gibbsite was used as the Al source, smallest for kaolin and intermediate for metakaolin. The endotherm peak temperature of the hydrogarnet dehydration endotherm was affected by the amount of hydrogarnet and the Si content of hydrogarnet. The thermal stability and structural order of 11 Å tobermorite were reduced with the incorporation of Al and, as a result, 11 Å tobermorite transformed into 9.3 Å tobermorite at lower temperatures while the transformation of the latter into beta-wollastonite required more energy. There exists a direct relationship between the 9.3 Å tobermorite and beta-wollastonite formation temperatures. Solid-state 29Si and 27Al MAS NMR data support these findings.

en_US

dc.format

No Code

en_US

dc.publisher

Springer

en_US

dc.relation.ispartof

Journal Of Thermal Analysis And Calorimetry

en_US

dc.subject.classification

Physical Chemistry

en_US

dc.title

DTA-TG Study of the CaO-SiO2-H2O and CaO-Al2O3-SiO2-H2O Systems Under Hydrothermal Conditions

en_US

dc.type

Journal Article

utslib.citation.volume

1

en_US

utslib.citation.volume

56

en_US

utslib.for

0301 Analytical Chemistry

en_US

utslib.for

0306 Physical Chemistry (Incl. Structural)

en_US

utslib.for

0303 Macromolecular And Materials Chemistry

en_US

utslib.for

0399 Other Chemical Sciences

en_US

pubs.embargo.period

Not known

en_US

pubs.organisational-group

/University of Technology Sydney

pubs.organisational-group

/University of Technology Sydney/Faculty of Engineering and Information Technology

pubs.organisational-group

/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering

pubs.organisational-group

/University of Technology Sydney/Faculty of Science

pubs.organisational-group

/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences

Simultaneous DTA-TG is an excellent technique for evaluating phases formed in hydrothermally treated CaO-SiO2-H2O and CaO-Al2O3-SiO2-H2O systems. Thermal analysis in combination with XRD and SEM, revealed that in the CaO-Al2O3-SiO2-H2O system the amount of hydrogarnet formed was the largest when gibbsite was used as the Al source, smallest for kaolin and intermediate for metakaolin. The endotherm peak temperature of the hydrogarnet dehydration endotherm was affected by the amount of hydrogarnet and the Si content of hydrogarnet. The thermal stability and structural order of 11 Å tobermorite were reduced with the incorporation of Al and, as a result, 11 Å tobermorite transformed into 9.3 Å tobermorite at lower temperatures while the transformation of the latter into beta-wollastonite required more energy. There exists a direct relationship between the 9.3 Å tobermorite and beta-wollastonite formation temperatures. Solid-state 29Si and 27Al MAS NMR data support these findings.

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